US Patent 8235620 Fluid applicator

Applicators for fluids such as paints utilizing a roller are known and more recently utilization of an incrementally displaceable piston in order to force fluid flow to a roller has been disclosed. In order to ensure appropriate presentation of the fluid, that is to say paint, to the roller an appropriate gap between the roller and the housing is required. By position of a cam and/or flap control of a housing to roller gap is achieved.